Hardware-Ben
From Qi-Hardware
Contents |
Overview
- LCD: 320x240 (40x30 character in a text console)
- NAND flash: 2GB
- SDRAM: 32MB
- ...
Status
- Flashing bootloader, kernel, and rootfs via USB works.
- Serial console via GND/RXD/TXD pads under the battery works.
- LCD works
- After a few minutes of inactivity on the console, it will go blank. Pressing any key brings it back.
- Keyboard works
- Audio/ALSA works.
- Micro-SD seems to have issues, this is being worked on.
- ...
Pinouts
PCB 08.50 (ben)
Micro-SD pins on testpads
Pin TP note ------------------ #1 TP14 data2 #2 TP15 cd/data3 / _CS #3 TP17 cmd / mosi #4 sdVCC switched by Q4 (fet?) controlled via line from cpu (on TP11) #5 TP16 clock #6 GND #7 TP12 data0 / miso #8 TP13 data1
Serial pins
See Ben_source_code#serial_console.
System information
$ cat /proc/cpuinfo system type : JZ4740 processor : 0 cpu model : Ingenic JZRISC V4.15 BogoMIPS : 335.05 wait instruction : yes microsecond timers : no tlb_entries : 32 extra interrupt vector : yes hardware watchpoint : yes, count: 1, address/irw mask: [0x0fff] ASEs implemented : shadow register sets : 1 core : 0 VCED exceptions : not available VCEI exceptions : not available
$ cat /proc/mtd mtd0: 00400000 00080000 "NAND BOOT partition" mtd1: 00400000 00080000 "NAND KERNEL partition" mtd2: 1f800000 00080000 "NAND ROOTFS partition" mtd3: 60000000 00080000 "NAND DATA partition"
$ uname -a Linux OpenWrt 2.6.31-rc6-gf1e89c8-dirty #2 PREEMPT Wed Sep 9 19:09:31 CST 2009 mips unknown
$ cat /proc/iomem 00000000-01ffffff : System RAM 00010000-002adebf : Kernel code 002adec0-003155ff : Kernel data 10020000-10020037 : jz4740-i2s 10021000-10030fff : jz-mmc.0 10021000-10021fff : jz-mmc 10042000-10051fff : jz_i2c.0 13010000-1301ffff : jz4740-nand.0 13010000-1301ffff : jz4740-nand 13030000-1303ffff : jz-ohci.0 13040000-1304ffff : jz-udc.0 13050000-1305ffff : jz4740-fb 13050000-1305ffff : jz4740-fb
$ cat /proc/interrupts
CPU0
9: 9173 INTC serial
14: 3 INTC MMC/SD
23: 144089 INTC jz-timerirq
32: 0 DMA MMC Rx
33: 0 DMA MMC Tx
144: 1 GPIO Bank D MMC card detect
162: 0 GPIO Bank D matrix-keypad
163: 23 GPIO Bank D matrix-keypad
164: 14 GPIO Bank D matrix-keypad
165: 25 GPIO Bank D matrix-keypad
166: 47 GPIO Bank D matrix-keypad
167: 15 GPIO Bank D matrix-keypad
168: 18 GPIO Bank D matrix-keypad
170: 0 GPIO Bank D matrix-keypad
ERR: 0
GPIO pins
The Jz4720 has only a limited number of pins as outputs to the board. Furthermore, several functions take up gpio pins which are therefore not usable for other functions. Those devices are the sdram and nand controller, lcd controller and mmc+sd controller. Below is a table showing how they are used. Please complete this table. The missing entries are not connected to a pad in the Jz4720.
Port A
- 01 sdram data 0
- 03 sdram data 1
- 05 sdram data 2
- 07 sdram data 3
- 08 sdram data 4
- 09 sdram data 5
- 10 sdram data 6
- 11 sdram data 7
- 12 sdram data 8
- 13 sdram data 9
- 15 sdram data 10
- 17 sdram data 11
- 22 sdram data 12
- 26 sdram data 13
- 28 sdram data 14
- 30 sdram data 15
Port B
- 00 sdram address 0
- 01 sdram address 1
- 02 sdram address 2
- 03 sdram address 3
- 04 sdram address 4
- 05 sdram address 5
- 06 sdram address 6
- 07 sdram address 7
- 08 sdram address 8
- 09 sdram address 9
- 10 sdram address 10
- 11 sdram address 11
- 12 sdram address 12
- 13 sdram address 13
- 14 sdram address 14
- 15 nand command latch
- 16 nand address latch
- 17 SHDN_HOST???
- 18 TP23 (free)
- 19 sdram dcs
- 20 sdram ras
- 21 sdram cas
- 22 ???
- 23 sdram cke
- 24 sdram cko
- 25 sdram cs1
- 26 sdram cs2
- 27 USB ID
- 28 ???
- 29 Audio output enable
- 30 TP25 (free)
- 31 ???
Port C
- 00 lcd data 0
- 01 lcd data 1
- 02 lcd data 2
- 03 lcd data 3
- 04 lcd data 4
- 05 lcd data 5
- 06 lcd data 6
- 07 lcd data 7
- 08 TP 35 (unused)
- 09 TP 36 (unused)
- 10 keyboard out 0
- 11 keyboard out 1
- 12 keyboard out 2
- 13 keyboard out 3
- 14 keyboard out 4
- 15 keyboard out 5
- 16 keyboard out 6
- 17 keyboard out 7
- 18 lcd pixel clock
- 19 lcd hsync
- 20 lcd vsync
- 21 LCD SPI chipselect
- 22 LCD SPI data
- 23 LCD SPI clock
- 24 sdram write enable 1
- 27 Charge detect
- 28 nand read enable
- 29 nand write enable
- 30 nand flash ready/busy
- 31 select uart or jtag on pad 147; not a gpio pin
Port D
- 00 SD Card detect
- 02 SD Card power enable
- 04 Speaker AMP enable
- 06 Shutdown detect
- 08 SD Card command
- 09 SD Card clock
- 10 SD Card data 1
- 11 SD Card data 2
- 12 SD Card data 3
- 13 SD Card data 4
- 15 TP 38 (free)
- 18 Keyboard in 1
- 19 Keyboard in 2
- 20 Keyboard in 3
- 21 Keyboard in 4
- 22 Keyboard in 5
- 23 Keyboard in 6 (i2c?)
- 24 Keyboard in 7 (i2c?)
- 25 uart transmit
- 26 Keyboard in 8 (uart receive)
- 27 Buzzer, controlled with pwm4. Piezo-electric buzzer; not related to soundcard output.
- 28 USB detect
- 29 power button
